Pittsburgh Steelers safety Robert Golden is going after the company he hired to plan his wedding, 'cause he says they wrecked his big day ... and were even responsible for sending a guest to the hospital.
According to court docs, obtained by TMZ Sports, Golden says he hired Genesis Master of Events last year to help him and his fiancee plan his July 2nd nuptials in Fresno, CA.
Golden says it was 102 degrees on the day of their wedding -- and the company failed to tell them that the AC was broken inside their reception venue, The Fresno Ballroom.
In the docs, Golden says at least 60 of their guests left early 'cause of the heat. He also claims his wife had to change out of her wedding dress early ... and the ice sculpture and cake "were melted and unusable."
The NFLer says it was so hot several guests had to receive IVs the next day ... and one guest was admitted to the hospital for severe dehydration.
To top it all off -- Golden says the company won't hand over their wedding pictures, videos or gifts that guests delivered to their office before and after the wedding.
Golden is suing Genesis Master of Events for an unspecified amount.
We reached out to GMOF for comment -- so far, no word back.